The vertical columns in the Periodic Table are termed as — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

# Vertical Columns in the Periodic Table The vertical columns in the Periodic Table are termed as **Groups** (or Families). ## Step-by-Step Explanation: 1. **Structure of Periodic Table**: The Periodic Table is organized in rows (periods) and columns (groups). 2. **Vertical Arrangement**: Elements arranged vertically (from top to bottom) share the same number of valence electrons in their outermost shell. 3. **Definition of Groups**: Each vertical column is called a **Group** because elements within it have: - Similar chemical properties - The same number of valence electrons - Similar reactivity patterns 4. **Example**: Group 1 (alkali metals) contains Li, Na, K, Rb, Cs — all having 1 valence electron and similar properties. 5. **Numbering**: Groups are numbered 1-18 (modern IUPAC system) or IA-VIIIA (older system). **Answer: B — Groups** (also acceptable: Families, as they are synonymous terms for vertical columns)